Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13ff28b940c8720…

MALICIOUS

PDF

88.5 KB Created: 2021-07-28 13:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 255096cf1ff098b6a0c232be38c85940 SHA-1: db8ce439b1bf755cba33d33aa8b87821560bd044 SHA-256: e13ff28b940c872057e3971262da1c14a44e7c22536da6d090e92493cef68029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised upload storage and disposable hosting. The embedded URLs, such as 'http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91a9196e0---gewizop.pdf', suggest a phishing or malware distribution scheme disguised as legitimate content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://brs.jo/userfiles/files/kifasutafe.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/30348130852.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/18278646127.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/09cb5d56e5e35ceed47adab48b3f8571/59428921064.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf43db9e1---ragimanazed.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/tokobegerelorogowuj.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/37037966983.pdfIn PDF document text
    • https://afayl.com/userfiles/file/jabukasedazetira.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc93c4a09c---ziwakinabuxipik.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/xixij.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91a9196e0---gewizop.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/709329638cbe2460ec0cb9fca510135a/49427484930.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kepagevukozudorubonerug.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h91pptbucvf6hcmfi2ofesv4dk/josew.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3f368e2b4907da457c9ff9acc8a7c659/78817230683.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/caeac23c74703911084f9211b3a01fab/walodikonomu.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/61039826844.pdfIn PDF document text
    • https://binhvi.com/upload/files/wenoregemujarukatogolun.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43477154330.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135f340e70---nujojilovubeva.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f26e036a---radutumovimojovized.pdfIn PDF document text
    • http://22743333.com/userfiles/files/mikujitareti.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/sufudotitinonazazi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/14dd09ea88da4f727e28f3cff7cd56b6/fedetasefusasitojobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=call+of+duty+modern+warfare+3+mod+apk+dataPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10992 bytes
SHA-256: 4e673d07400f9857baeb803873b40701a4ed1b15de71f4d1395da756f467e177
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 20484 bytes
SHA-256: 9bb7233819e08bbc434fcb20fde2860376ed658a6453da29a101a5adbd978532
font_02_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1